Substituted phenylacetic acid compounds

ABSTRACT

Certain substituted Alpha -halo and Alpha mercaptophenylacetic acids and substituted phenylacetic acids having in Alpha -position a sulfur-containing group, a cyano group, or an amino group, their substantially non-toxic esters, salts, and acid amides as well as 5-phenyl substituted 2-imino-4oxothiazolidines and 5-phenyl substituted 2,4-dioxothiazolidines have a high anti-inflammatory, analgesic, and antipyretic activity, low toxicity, and/or a favorable therapeutic index with minor or no side-effects. Preferred compounds of this invention are Alpha , m-dichloro-p-cyclohexylphenylacetic acids and its esters and salts.

Diamond et al.

Feb. 4, 1975 SUBSTITUTED PHENYLACETIC ACID COMPOUNDS Inventors: Julius Diamond, Lafayette Hill;

Norman J. Santora, Roslyn, both of Pa.

Assignee: William H. Rorer Inc., Fort Washington, Pa.

Filed: May 5, 1970 Appl. No.: 34,870

US Cl 260/469, 424/309, 424/316, 260/141, 424/270, 260/268 C, 260/293.64, 260/293.73, 260/293.8, 260/293.81, 260/306.7, 260/326.3, 260/326.5 S,

260/326.5 SF, 260/326.5 E, 260/326.5 A, 260/347.4, 260/453 AP, 260/454, 260/455 R, 260/465 G, 260/471 R, 260/470, 260/471 A, 260/473 A, 260/502.6, 260/507 R,

260/515 A, 260/515 M, 260/465 D, 260/465 E, 260/516, 260/518 A, 260/520, 260/552 R, 260/558 R, 260/558 S, 424/308 Int. Cl. C070 63/32, C07c 69/62 Field of Search 260/515 A, 469, 501.15, 260/469, 515 R, 471 A, 473 R, 471 R, 518

R, 473 A, 520,470,465 D, 515 M [56] References Cited UNITED STATES PATENTS 3,435,075 3/1969 Glamkowski et al. 260/590 3,598,867 8/1971 Fouche 260/515 3,624,142 11/1971 Shen et al. 260/515 3,625,984 12/1971 Levine et al...... 260/515 3,626,012 12/1971 Fried et al. 260/515 Primary Examiner-James A. Patten Attorney, Agent, or Firm-Erich M. H. Radde [57] ABSTRACT Certain substituted a-halo and a-mercaptophenylacetic acids and substituted phenylacetic acids having in a-position a sulfur-containing group, a cyano group, or an amino group, their substantially non-toxic esters, salts, and acid amides as well as S-phenyl substituted 2-imino-4-oxothiazolidines and 5-phenyl substituted 2,4-dioxothiazolidines have a high anti-inflammatory, analgesic, and antipyretic activity, low toxicity, and/or a favorable therapeutic index with minor or no sideeffects. Preferred compounds of this invention are a, m-dichloro-p-cyclohexylphenylacetic acids and its esters and salts.

16 Claims, No Drawings SUBSTITUTED PHENYLACETIC ACID COMPOUNDS BACKGROUND OF THE INVENTION 1. FIELD OF THE INVENTION The present invention relates to valuable novel substituted phenylacetic acids and more particularly to substituted a-halophenylacetic acids and substituted phenylacetic acids having in a-position a sulfur containing group, especially substituted a-mercaptophenylacetic acids, to a process of making such compounds, to pharmaceutical compositions containing the same, and to using such compositions in therapy as anti-inflamrnatory, antipyretic, and analgesic agents.

2. DESCRIPTION OF THE PRIOR ART A number of substituted phenylacetic acids and their esters have been tested for their anti-inflammatory, analgesic, antipyretic properties but none of them have been accepted by the medical profession for the treatment ofhumans or have been marketed by the pharma ceutical industry.

SUMMARY OF THE INVENTION It is one object of the present invention to provide novel and valuable substituted phenylacetic acid compounds of high anti-inflammatory, analgesic, and antipyretic activity, low toxicity and/or a favorable therapeutic index with considerably reduced side-effects.

Another object of the present invention is to provide simple and effective processes of making such novel and valuable substituted phenylacetic acid compounds.

Still another object of the present invention is to provide pharmaceutical compositions containing such novel and valuable substituted phenylacetic acid compounds.

A further object ofthe present invention is to provide a method of administering such pharmaceutical compositions for their anti-inflammatory, analgesic, and antipyretic activity.

Other objects and advantageous features of the present invention will become apparent as the description proceeds.

In principle the substituted phenylacetic acid compounds according to the present invention are compounds of the following Formula I R is hydrogen or lower alkyl with l to 8 carbon atoms such as methyl;

X is halogen such as chloro, bromo, iodo, fluoro;

mercapto SH; lower alkylthia SR; lower alkylsulfonyl SO R; thiocyano -SCN; cyano; sulfo of the formula SO M, wherein M is a substantially nontoxic alkali metal; thiosulfo ofthe formula S- O M; lower alkanoylthio S.CO.R; lower alkylxanthyl amino; lower alkylamino NHR and di-(lower alkyl) amino lower alkanoylamino NH.CO.R; the group of the for' mula and

or a. heterocyolic ring of the formula The present invention comprises also the substantially non-toxic, pharmaceutically acceptable esters and salts of the substituted phenylacetic acids of Formula I wherein Y is hydroxyl. Such esters are, for instance:

a. the esters with lower aliphatic alcohols such as with methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, n-amyl alcohol, isobutylcarbinol, n-hexanol, n-heptanol, n-octanol, monomethylether of ethylene glycol, allyl alcohol, diethylaminoethanol, piperidinoethanol, piperazinoethanol, pyrrolidinoethanol, and other alcohols with l to 8 carbon atoms;

b. the esters with alicyclic alcohols and alcohols of the terpene series, such as with cyclopentanol, cyclohexanol, 2-methylcyclohexanol, cyclohexylcarbinol, menthol, borneol, fenchyl alcohol, and other alicyclic alcohols with 6 to 14 carbon atoms;

c. the esters with hydroxyl substituted aryl compounds such as with phenol, cresol, guajacol, and other phenolic compounds with 6 to 14 carbon atoms;

d. the esters with aryl substituted alkanols such as benzyl alcohol, phenylethyl alcohol, anisalcohol, and other aryl substituted alkanols with 7 to 14 carbon atoms;

e. the esters with heterocyclic alcohols such as furfuralcohol and others.

The lower alkyl estersare the preferred esters.

Suitable substantially non-toxic, pharmaceutically acceptable salts of the substituted phcnyl acetic acids of Formula I, wherein Y is hydroxyl, are, for instance, the alkali metal or alkaline earth metal salts, such as the sodium, potassium, or calcium salts, the ammonium salts, or the salts with organic bases such as the di-lower alkylammonium salts, for instance, the dimethylammonium salts, the diethylammonium salts, the hydroxy lower alkylammonium salts such as the R-hydroxyethylammonium salts, the piperazinium salts, the piperidinium salts, the lower alkyl benzyl -ammonium salts such as the a-methylbenzylammonium salts, and others.

The term lower alkyl as used herein and in the claims annexed hereto designates straight-chain or branched alkyl with l to 8 carbon atoms.

In particular the substituted phenylacetic acid compounds of the present invention are a. a-halophenylacetic acids of Formula II (c) oz-Slllftll derivatives of such a-mercaptophenylacetic acids of Formula IV S-derivative R2 IV.

such as the corresponding sulfides, disulfides, thiosulfates, xanthates, isothiuronium halides, oxothiazolidines, and the like compounds which serve as latent forms of precursors of the a-mercaptophenylacetic acids of Formula II.

Not only the substituted phenylacetic acids of Formulas II to IV but also their non-toxic salts, the esters, and the amides of said substituted phenylacetic acids have proved to be useful anti-inflammatory, antipyretic, and analgestic agents and are used in reducing the inflammation and pain associated with polyarthritis in mammals.

The compounds of Formula I are administered preferably orally as their non-toxic salts or esters in the form of powder, granules, capsules, coated or uncoated compressed tablets, or as an aqueous suspension or solution. They may also be administered parenterally as a sterile aqueous solution of their non-toxic salts. Compounds that are especially useful include the a,mdihalo-p-cycloalkylphenylacetic acids, a,o-dihalo-pbiphenylylacetic acids, a,m-dihalo-p-lower alkylphenylacetic acids. The preferred compounds of this invention are a,m-dichloro-p-cyclohexylphenylacetic acid of Formula V its lower alkyl esters, and its non-toxic salts; they are administered preferably orally in a dose range of 0.l mg. to 10 mg. per kg. of body weight. The acute oral toxicity of the preferred compounds are relatively low.

The starting materials for producing the substituted 60 -halophenyl acetic acids according to Formula II are lower alkyl esters of the corresponding substituted phenylglycolic acid in which R, is lower alkyl (C, to C cycloalkyl (C to C phenyl, halophenyl, nitrophenyl, trifluoromethylphenyl, cyanophenyl, or methylsulfonylphenyl; R is hydrogen or lower alkyl; R is lower alkyl, and R is halogen, nitro, cyano, trifluoromethyl, methylsulfonyl, or hydrogen (when R is substituted phenyl). The substituted phenylglycolic acid lower alkyl esters of Formula VII are prepared by the method disclosed in copending patent application Ser. No. 767,058 from the lower alkyl esters of the corresponding substituted phenylglyoxylic acid of Formula VI either by catalytic hydrogenation when R is hydrogen, or by reaction with a lower alkyl Grignard reagent when R; is lower alkyl, as illustrated by the following equation:

0 0H m-Gli-cooa H2 R1 c-oooR I Ra MgHal R2 R2 VI VII When R is nitro, it is preferable to reduce the lower alkyl ester of Formula VIII of the substituted mnitrophenylglyoxylic acid with sodium borohydride in methanol to obtain the corresponding lower alkyl ester of Formula IX of a substituted m-nitrophenylglycolic acid. This procedure is illustrated by the following equation:

OH H NaBH; (E 1- COOR R, HCOOR l 1 N02 N02 VIII IX Substituted m-t'luorophenylglycolate esters of Formula XIII are also obtained by catalytic hydrogenation of the corresponding substituted m-nitrophenylglycolate esters of Formula X to give the substituted maminophenylglycolate esters of Formula XI which, after conversion to the diazonium fluoroborate of Formula XII are thermally decomposed to the substituted m-fluorophenylglycolate esters of Formula XIII as shown in the following equations:

As stated above, the substituted phenylglyoxylic acid lower alkyl esters of Formula VI are produced according to the method of copending US. Pat. application Ser. No. 767,058 by reacting an alkylbenzene, a cycloalkylbenzene, or a biphenyl of Formula XIV with a lower alkyl oxalyl chloride of Formula XV in the presence of aluminum chloride, The resulting lower alkyl esters of the p-alkyl, p-cycloalkyl, or pbiphenylylglyoxylic acids of Formula XVI may be halogenated according to the method described in said US. Pat. application Ser. No. 767,058, or they may be nitrated with fuming nitric acid at about 0C. to produce respectively the corresponding lower alkyl esters of a substituted m-halophenylglyoxylic acid of Formula XVII or a substituted m-nitrophenylglyoxylic acid of Formula VIII according to the following equations:

[I A1013 ILL 121- CICCOOR R1 -COOR XVI Additional variations in R are obtained by reacting a lower alkyl ester of a substituted mhalophenylglyoxylic acid of Formula XVII as follows:

a. with cuprous cyanide in quinoline at about 150C.

to produce a lower alkyl ester of a substituted meyanophenylglyoxylic acid of Formula XVIII:

XVII XVIII b. with trifluoromethyliodide and copper powder at about C. in dimethylformamide to produce a lower alkyl ester of a substituted m-trifluoromethylphenylglyoxylic acid of Formula XIX by following the method described by Y. Kobayashi and I. Kumadaki in Tetrahedron Letters" vol. 47, p. 4095 (1959).

XVII XIX c. with cuprous methanesulfinate in quinoline at about 150C. to produce a lower alkyl ester of a substitute m-methylsulfonylphenylglyoxylic acid of Formula XX:

0 IL CuSOzCHz Rr- (,CO 0 R I Hal XVII R (5-COOR The substituted phenylglycolic acid lower alkyl ester of Formula VII is reacted with a phosphorus trihalide, phosphorus pentahalide, phosphorus oxyhalide, sulfurylhalide, thionyl halide, or sulfur halide to produce a substituted a-halophenylacetic acid lower alkyl ester of Formula XXI in which Hal is F, Cl, Br, or I.

Hal ill-00 OR OH i l-coon R1- VII XXI The ester of Formula XXI is heated with acetic acid containing the corresponding hydrogen halide to give a substituted a-halophenylacetic acid of Formula II.

H -+CO OR R1- XXI II II XXII Reaction of the lower alkyl ester of a substituted a-halophenylacetic acid of Formula XXI with ammonia or a lower alkylamine leads to a substituted a-halophenylacet-amide of Formula XXIII in which R is hydrogen or lower alkyl, and R" is hydrogen or lower alkyl.

XXI XXIII The substituted a-fluorophenylacetic acid derivatives of Formula XXV are also obtained from the corresponding a-iodo, a-bromo, or a-chlorophenylacetic acid derivatives of Formula XXIV by reaction with potassium fluoride at about l30200C.

XXIV XXV The substituted a-halophenylacetic acids of Formula II, their salts of Formula XXII, or amides of Formula XXIII, or their lower alkyl esters of Formula XXI may be reacted with various nucleophilic reagents to replace the a-halogen group. In particular sulfurcontaining nucleophilic reagents are used such as alkali hydrosulfides MSH, alkali sulfides M S, alkali thiolalkanoates MSCOR, alkali thiocyanates MSCN, alkali sulfites M SO alkali thiosulfates M 830 alkali alkanesulfinates M SO R, alkali alkylmercaptides MSR. With excess alkali hydrosulfide a mixture of a substituted a-mercaptophenylacetic acid derivative of Formula XXVI and the corresponding substituted a,a-dithiodiacetic acid derivative of Formula XXVII are produced. The mercaptan and the disulfide may be separated by fractional crystallization of their salts. Reduction ofthe disulfide with zinc amalgam and dilute sulfuric acid produces the mercaptan. Oxidation of the mercaptan with dilute iodine solution gives the disulfide.

sir

1t1-- 1? 0 o M R2 XXvr Reaction of a substituted a-halophenylacetic acid derivative of the Formulas XXI, II, XXII, or XXIII with thiourea at elevated temperatures, for instance, in boiling ethanol produces a 5-substituted-2-imino-4- oxothiazolidine of Formula XXVIII:

NII A I m S IlIIOI1l'lI l urfl fl -ook 1:,-\ o

| R. I II: Rt XXI II: xxvm' Hydrolysis of the imino compound of Formula XXVIII with hydrobromic acid in glacial acetic acid leads to a 5-substituted-2,4-dioxothiazolidine of Formula XXIX:

II. XXX

Reaction ofa substituted a-halophenylacetic acid derivative of the Formulas XXI, XXIII, II, or XXII with an alkali lower alkylmercaptide produces a substituted a-Iower alkylthiophenylacetic acid derivative of Formula XXX] in which R is a lower alkyl with I to 8 carbon atoms.

Hal A NaSR Rll-OOOM R;

XXII XXXI Reaction ofa substituted a-halophenylacetic acid derivative of the Formulas XXI, II, XXII, or XXIII with an alkali lower alkyl xanthate produces a substituted a-alkyIxanthyl-phenylacetic acid derivative of the Formula XXXII in which R is lower alkyl of l to 8 carbons:

Reaction ofa substituted a-halophenylacetic acid derivative of the Formulas XXI, II, XXIII, or XXII with an alkali thioalkanoate produces a substituted lower alkanoylthiophenylacetic acid of Formula XXXIII in which R is a lower alkyl with l to 8 carbon atoms:

Reaction of a substituted a-halophenylacetic acid derivative of Formulas XXI, II, XXII, or XXIII with an alkali thiocyanate produces a substituted a-thiocyanophenylacetic acid derivative of Formula XXXIV:

SCN

XXII XXXIV Reaction ofa substituted a-halophenylacetic acid derivative of Formula XXI, II, XXII, or XXIII with an alkalicyanide produces a substituted a-cyanophenylacetic acid derivative of Formula XXXV:

XXII

XXXV

Reaction ofa substituted a-halophenylacetic acid derivative of Formulas XXI, II, XXII, or XXIII with an alkali sulfide produces a substituted a,a'-thiodiacetic acid derivative of Formula XXXVI:

2 Hal 3 -(I; COOM K S R1 -COOM XXII XXXVI Reaction ofa substituted a-halophenylacetic acid derivative of Formulas XXI, II, XXII, or XXIII with an alkali sulfite produces a substituted a-sulfophenylacetic acid derivative of Formula XXXVII:

SO N8. l-GO OM s XXII XXXVII Reaction ofa substituted a-phenylacetic acid derivative of Formulas XXI, II, XXII, or XXIII with an alkali thiosulfate produces a substituted a-thiosulfophenylacetic acid derivative of Formula XXXVIII:

Reaction ofa substituted a-halophenylacetic acid derivative of Formulas XXI, II, XXII, or XXIII with an alkali alkanesulfinate produces a substituted a-alkylsulfonylphenylacetic acid derivative of Formula XXXIX, in which R is lower alkyl.

XXII

SOzR

XXXIX Substituted a-aminophenylacetic acids of Formula XLI in which R and R are hydrogen or lower alkyl are prepared from substituted phenylglyoxylic acids of Formula XL with ammonia or a lower alkylamine and hydrogen over a Raney nickel or platinum catalyst. The substituted phenylglyoxylic acids of Formula XL are obtained from the corresponding substituted phenylglyoxylic acid lower alkyl esters of Formula VI by hydrolysis with aqueous-alcoholic alkali hydroxide or alkali carbonate.

0 IL Naz oa R L-COOR Substituted a-aminophenylacetic acids of Formula XLII, in which R and R are hydrogen, may also be prepared by hydrogenation of a substituted phenylglyoxy- Iic acid oxime of Formula XLIII over a platinum catalyst. The oxime is obtained from the substituted phenylglyoxylic acid of Formula XL with hydroxylamine.

0 g NHRR4 1 CO OH R2 XL R2 XLI sis, yields a substituted a-aminophenylacetic acid of Formula XL, in which R is a lower alkyl.

N H acetic anhydride R1 CO OH The substituted phenylacetic acids of this invention and their carboxyl derivatives are racemic, and may be resolved into their optical isomers by standard procedures. Preferably a substituted phenylacetic acid is reacted in alcoholic or acetone solution with an equivalent amount of an optically active primary, secondary, or tertiary amine such as cinchonidine, cinchonine, quinine, ephedrine, a-methylbenzylamine, secondary butylamine, secondary amylamine, and others. The diastereomeric amine salts produced thereby, are separated by fractional crystallization, and each optically active salt is hydrolyzed with dilute mineral acid to produce the dextro or levo form, respectively, of the substituted phenylacetic acid. Alternatively, the lower alkyl ester of a substituted phenylacetic acid is reacted with an optically active primary or secondary amine such as ephedrine, a-methylbenzylamine, secondary butylamine, and others, to produce a mixture of diastereomeric substituted phenylacetamides which are separated by fractional crystallization. Each optically active phenylacetamide may be hydrolyzed with mineral acid to its respective optically active substituted phenylacetic acid.

Examples of compounds according to the present invention which, however, is not limited thereto, are:

l. a,m-Dichloro-p-cyclohexylphenylacetic acid 2. a,m-Dichlorop-cyclohexylphenylacetic acid, so-

dium salt 2a. a,m-Dichloro-p-cyclohexylphenylacetic acid,

diethylammonium salt 3. a,m-Dichloro-p-cyclohexylphenylacetic ethyl ester 4. a,m-Dichloro-p-cyclohexylphenylacetamide 5. a,m-Dichloro-p-cyclohexyl-N- isopropylphenylacetamide 6. a,m-Dichloro-p-cyclohexyl-a-methylphenylacetic acid 7. a-Bromo-m-chIoro-p-cyclohexylphenylacetic acid 8. m-Bromo-a-chloro-pscyclohexylphenylacetic acid 9. m-Chloro-p-cyclohexyl-a-mercaptophenylacetic acid 10. m-Chloro-p-cyclhexyl-a-acetomercaptophenylacetic acid acid,

l l. m-Chloro-p-cyclohexyl-a-methylmercaptophenylacetic acid 12. m-Chloro-p-cyclohexyl-a-methylsulfonylphenylacetic acid l3. m'Chloro-p-cyclohexyl-a-thiocyanophenylacetic acid acid

l5. m-Chloro-p-cyclohexyl-wacetaminophenylacctic acid l6. a,a-Di-(m-chloro-p-cyclohcxylphenyl)-d,a-

dithiodiacetic acid 17. a-Chloro-p-cyclohexyl-m-nitrophenylacetic acid m-Chloro-p-cyclohexyl-a-aminophenylacetic l8. a-Chloro-m-cyano-p-cyclohexylphenylacetic acid 19. a-Chloro-p-cyclohexyl-m-trifluoromethylphenylacetic acid 20. a,m-Dichloro-p-cyclopentylphenylacetic acid 2 l. a,m-Dichloro-p-cycloheptylphenylacetic acid 22. 5-(m-Chloro-p-cyclohexylphenyl)-2,4-

dioxothiazolidine 23. 5-(m-Chloro-p-cyclohexylphenyl)-5-methyl-2- imino-4-oxothiazolidine 24. 2-(m-Chloro-p-cyclohexylphenyl)-2-imino-4- oxothiazolidine 25. a,a'-Di-(m-chloro-p-cyclohexylphenyl)-a,a-

thiodiacetic acid 26. a,o'-Dichloro-p-biphenylacetic acid 27. a,m-Dichloro-p-isobutylphenylacetic acid 28. m-Chloro-p-cyclohexyl-a-sulfophenylacetic acid,

sodium salt 29. m-Chloro-p-cyclohexyl-a-thiosulfophenylacetic acid, sodium salt 30. m-Chloro-p-cyclohexyl-a-cyanophenylacetic acid, sodium salt 31. m-Chloro-p-cyclohexyl-a-ethylxanthylphenylacetic acid, ethyl ester 32. o'-Bromo-a-chloro-p-biphenylacetic acid 33. a,m-Dichloro-p-sec-amylphenylacetic acid 34. a-Chloro-o'-trifluoromethyl-p-biphenylacetic acid 35. a-Chloro-o'-nitro-p-biphenylacetic acid 36. a-Chloro-o'-cyano p-biphenylacetic acid 37. m-Chloro-p-cyclohexyl-a-fluorophenylacetic acid 38. o'-Chloro-a-mercapto-p-biphenylacetic acid 39. m-Chlorop-isobutyl-a-mercaptophenylacetic acid. 40. a,m-Dichloro-p-cyclohexylphenylacetic acid,

benzyl ester.

41. a,m-Dichloro-p-cyclohexylphenylacetic menthyl ester.

42. a,m-Dichloro-p-cyclohexylphenylacetic acid, cy-

clohexyl ester.

43. a,m-Dichloro-p-cyclohexylphenylacetic phenyl ester.

acid,

acid,

44. a,m-Dichloro-p-cyclohexylphenylacetic acid, di-

ethylaminoethyl ester. 45. a,m-Dichloro-p-cyclohexylphenylacetic piperidinoethyl ester.

acid,

DESCRIPTION OF THE PREFERRED EMBODIMENTS The following examples serve to illustrate the present invention without, however, limiting the same thereto.

EXAMPLE 1 a,m-Dichloro-p-cyclohexylphenylacetic acid ethyl ester.

o ir O-Qdnoooom 01 imm.

221.75 g. (0.747 mole) of the ethyl ester of m-chlorop-cyclohexylphenylglycolic acid are stirred with 106.67 g. (0.895 mole) ofthionylchloride at room temperature for 24 hours and then heated to reflux for 6 hours. The cold reaction mixture is poured into 1 125 ml. 01 icc cold water with stirring. The mixture is cxtracted with 800 ml. of ether. The ethereal solution is washed with 450 ml. ofcold saturated sodium hydrocarbonate solution followed by washing twice, each time with 250 ml. of cold water. The ethereal solution is dried over anhydrous sodium sulfate and filtered. The solvent is removed by distillation under reduced pressure. Yield: 230.7 g. (97.9 ofliquid, b.p.ll8-122C./0.05 mm. Hg.

22.49 Cl. Found: 60.96 71 C; 6.46 H; 21.56 Cl.

EXAMPLE 2 a,m-Dichloro-p-cyclohexylphenylacetic acid III Q coo on 52.5 g. (0.167 moles) of the ethyl ester of a,m-

dichlor0-p-cyclohexylphenylacetic acid and 160 ml. of

glacial acetic acid containing 40 ml. of 37% hydrochloric acid are refluxed for 20 hours. The mixture is concentrated under reduced pressure to give a gummy residue (47.1 g.). The latter material is dissolved in 300 ml. of n-hexane, washed with ice-cold water (100 ml. total), dried over Na SO (sodium sulfate), and filtered. The hexane is removed to give 47.2 g. of product.

TLC (silica): 5 C 11,, 4 HCOOEt: l HCOOl-l,

R,- 0.64. 0.49 (trace).

EXAMPLE 3 a,m-Dichloro-p-cyclohexylphenylacetic acid sodium salt A solution of 12.4 g. of sodium bicarbonate in 135 ml. of water is added dropwise to a stirred solution of 47.1

g. (0.164 moles) of a,m-dich10ro-p-cyclohexylphenlacetic acid in cc. of methanol. The solvent is removed in vacuum, and the residue is dried by repeated distillations with anhydrous ethanol. The crystalline residue is triturated with ether (100 cc.), collected on a filter, and washed with ether. Aftery drying in a vacuum desiccator overnight, the crystalline product weighs 41.6 g. (91.3

TLC(si1ica): 5 C H :4 HCOOEM HCOOH. Ry 0.62, 0.49 (trace) Anal. Calculated for C H CI O Na:

54.38 C; 4.89 H; 22.93 Cl. Found: 54.10 C; 5.18 H; 21.75 Cl.

[EXAMPLE 4 Dicthylammonium salt of a,m-dichlorop-cyclohcxylphenylacetic acid Anhydrous diethylamine (0.11 moles) is added dropwise to a stirred solution of a,m-dichloro-p-cyclohexylphenylacetic acid (0.10 moles) in 100 ml. of n-hexane at 0 C. The precipitated diethylammonium salt is collected on a filter, washed with n-hexane, and dried in a vacuum desiccator. Yield: 34 g., white crystals, M.P. -1 15 C.

EXAMPLE 5 a,m-Dichloro-p-cyclohexyl-N- isopropylphenylacetamide OQ-(moorm omen.

5 g. (0.016 moles) of the ethyl ester of a,m-dichlorop-cyclohexylphenylacetic acid are stirred with 5.5 ml. of anhydrous isopropylamine and Linde 4A molecular sieve for 16 hours at room temperature. The reaction mixture is filtered and excess isopropylamine is removed in vacuum. The residue is taken up in ether and washed three times, each time with 15 ml. of 10% hydrochloric acid. The ether layer is dried over sodium sulfate, filtered, and the ether is removed. The residue is triturated with n-hexane to precipitate the amide, white crystals, M.P. 85-87 C.

TLC (silica): 5 C1Hgi4 HCOOEI: l HCOOH. R 0.75 Anal. Calculated for C H CHNO:

62.20 C; 7.06 H; 4.27 N; 21.60 Cl. Found: 6l.49 C; 6.98 H; 4.2l 70 N; 20.64 Cl.

EXAMPLE 6 a-Bromo-m-chloro-p-cyclohexylphenylacetic acid ethyl ester To 15.0 g. (0.0476 moles) of m-chloro-pwyclohexylphenylglycolic acid ethyl ester there are added slowly with stirring at 40-50 C. 23 g. (0.053 moles) of phosphorus pentabromide. The mixture is stirred at room temperature for 16 hours, then diluted with 70 ml. of petroleum ether, and poured into 125 ml. of ice-cold water. The organic phase is separated, washed with saturated aqueous sodium hydrogen carbonate solution, dried over anhydrous sodium sulfate, filtered, and the solvent removed in vacuo to leave 12.1 g. (70.8 of crude product. Distillation ol the residue gives 8.1 g. (47.4 of a pale yellow liquid. b.p. l57-l 61 (../().l mm. Hg.

TLC (silica): 5 C,H,;:4 HCOOEt:l HCOOH, R,- 0.90 Anal. Calculated for C H BrClO:

Calculated: 53.42 C; 5.60 H; 32.08 Cl Br Found: 53.42 C; 5.42 H; 31.6 C1 Br EXAMPLE 7 Diethylammonium salt of a-bromo-m-chloro-p-cyclohexylphenylacetic acid Br OQ-oHCQQNmwZHm The salt is prepared from a-bromo-m-chloro-pcyclohexylphenylacetic acid ethyl ester by treating the same with glacial acetic acid and 48 hydrobromic acid, and conversion to the diethylammonium salt with diethylamine in an analogous manner as described in Examples 2 and 3.

EXAMPLE 8 Ethyl ester of a,m-dichloro-p-cyclohexyl-a-methylphenylacetic acid 68.4 g. (0.330 moles) of phosphorus pentachloride are slowly added with stirring to 92.4 g. (0.300 moles) of m-chloro-p-cyclohexyl-a-methylphenylglycolic acid ethyl ester. The mixture is allowed to warm spontaneously and is stirred at room temperature for 16 hours. The cold reaction mixture is diluted with 340 ml. of petroleum ether and stirred with 500 ml. of ice water. The organic phase is separated and is then washed with cold 10 sodium bicarbonate solution (twice with 90 ml. each time) followed by a water wash. The organic phase is dried over sodium sulfate, filtered, and the solvent is removed under reduced pressure to give 86.3 g. (87.5 of the above ester, b.p. 155-l58 C./0.35 mm. Hg.

4 HCOOEt:l HCOOH, R 0.90. 0.71 (trace) C H CI O 6.73 H; 21.53 Cl 6.43 H; 21.62 Cl.

TLC (silica): 5 C 11 Anal. Calculated for Found: 62.92 C;

EXAMPLE 9 Sodium salt of a-chloro-m-nitro-p-cyclohexylphenylacetic acid The salt is prepared in the same manner as described in Example 3 except that the starting material is mnitro-p-cyclohexylphenylglycolic acid ethyl ester. The latter is obtained by nitration of p-cyclohexylphenylglyoxylic acid ethyl ester with fuming nitric acid at 0 C. and reduction with sodium borohydride.

EXAMPLE 10 Sodium salt of a-chloro-m-trifluoromethyl-p-cyclohexyl-phenylacetic acid Cl Q F3 EXAMPLE 11 The sodium salt of a-chloro-m-cyano-p-cycIohexylphenylacetic acid The salt is prepared in the same manner as described in Example 3 except that the starting material is mcyano-p-cyclohexylphenylglycolic acid ethyl ester. The latter is obtained from the correspnding m-bromo-pcyclohexylphenylglyoxylic acid ester with cuprous cyanide in quinoline at about C., followed by catalytic hydrogenation over platinum at 25 C. and 3 atm. pressure.

3 ,864,3 84 17 18 EXAMPLE 12 upon the product precipitates out. The cold reaction mixture is diluted with 2.3 l. of water. The light yellow solid is collected on a filter and washed with 20% ethanol. The product is dried at 60 C. in a vacuum to rec1 f l move most of the water, then stlrred wlth 2 l. anhyn E Loom drous ether, collected by filtration, washed with anhy- Sodium salt of a. o'-dichloro'p-biphenylylacetic acid tlrous ether, and dried at 60 C. in a vacuum. Yield: 145.2 g. (64.3 m.p. 240-242 C.

The salt is prepared in the same manner as described in Example 3 except that the starting material is o- "P- p y y y acid ethyl estef- TLC(silica): 5 toluene: 4 HCOOEt: 1 ucoou. R,= 0.44

Anal. Calculated for CHHHCINOS: EXAMPLE 13 58.34 c; 5.55 H; 9.07 N; 11.48 77 c1;

l0.38 '7- 5 Sodium salt of o-br0m0'a-chloro-p-biphenylylacetic Found 5209 a; C; 5.49 H; 8.22 7r N; 12.09 Cl;

- 10.08 s ac1d.

Cl eneoona EXAMPLE 17 20 5'[m-Chloro-p-cyclohexylphenyl]-2,4-

dioxothiazolidine The salt is prepared in the same manner as described in Example 3 except that the starting material is -orr o..o o'-br0mo-p-biphenylylglycolic acid ethyl ester. i

EXAMPLE 14 Sodium salt of a, m-dichloro-p-isobutylphenylacetic Nir acid 42 12 .o

l5.44 g. (0.05 moles) of 5-(m-chloro-p- The salt is prepared in the same manner as described cyclohexylphenyl)-2-1mino-4-oxothlazqhdlqe f F- fluxed with 200 ml. of48% hydrobrom1c ac1d w1th stirin Example 3 except that the starting material is mi g for 2 hou S Th hy is re 0 d b rn r. e m1cac1 mve y Chlom p lsobutylphenylglycohc ac1d ethyl ester distillation under reduced pressure. The residue is ex- EXAMPLE l5 tracted with ether. The ethereal solution is washed with water and dried over anhydrous magnesium sulfate. After removing the drying agent and the solvent, the residue is triturated with n-hexane. The white solid which separates is collected by filtration, washed with or l. n-hexane, and dried at 60 C. in a vacuum. Yield: 7.9 Q Q HCOON g. 51 M.P. 200.5 202.5 c.

The salt 15 prepared 1n the same manner as described TLC (silica). 5 4 HCOOEI. I HCOOH R6067 Sodium salt of a-chloro-o'-trifluoromethyl-p-biphenylyl-acetic acid in Example 3 except that the starting material is o'-tri- Anal. Calculated for C H ,ClN0 S: fluoromethyl-p-biphenylylglycolic acid ethyl ester. Z: S H; N; 57.89 c; 5.24 7' ;4.43 7 N; 11.96 1; EXAMPLE 16 11.08 s H C 5-(m-Chloro-p-cyclohexylphenyl)-2-imino 4- oxothiazolidine CI 55 EXAMPLE 18 C J:HCO0C2H5 a'-Di-[m-chloro-p-cyclohexylphenyl]-a,a'- dithiodiacetic acid crrc=o 4: 1 m C I *6 or NH 230.7 g. (0.732 moles) of the ethyl ester of a, NH m-dichloro-p-cyclohexylphenyl acetic acid are dissolved in 960 ml. of ethanol. To this solution there are O--bH-000H added 66.9 g. (0.878 moles) of thiourea. The mixture is heated under reflux with stirring for 26 hours, where- 181.8 g. (0.427 moles) of '[m-chloro-pcyclohexylphenyl]-2-imino-4-0xothiazolidine, 1 liter of sodium hydroxide solution, and 325 ml. of 95% ethanol are refluxed with stirring for hours. After distilling off the ethanol, the mixture is cooled to room temperature, washed three times with either, each time with 300 ml. of ether, and acidified with 310 ml. of 6N hydrochloric acid solution (1.86 moles) with stirring in the presence of 700 ml. of ether. The aqueous portion is extracted twice with ether, each time with 400 ml. of ether. The combined ethereal solution is dried over anhydrous magnesium sulfate and filtered. The solvent is removed under reduced pressure leaving the above acid.

EXAMPLE 19 Diethylammonium salt of a,a'di-[m-chloro-p-cyclohexylphenyl]-a',adithiodiacetic acid ;LC ()siiga): 45 i-ProH EtOAc: 17 Et NH :8 H O,

Anal. Calculated for C ,H ,C1,N,O S,:

60.57% C; 7.63% H; 9.93% Cl; 3.92% N;

8.98% S Found: 59.83% C; 7.77% H; 9.70% CI; 3.90% N;

EXAMPLE 20 Diethylammonium salt of m-chloro-p-cyclohexyl-a-mercaptophenylacetic acid The chloroform-ethylacetate filtrate from Example 9 is evaporated to dryness in vacuo, and the residue is triturated with ether to precipitate the above salt, m.p. 103 109 C.

TLC: 25 EtOH: 3 H 0: 4 NHqOH (28 R 0.81 m-Chloro-p-cyclohexyl-a-mercaptophenylacetic acid is also obtained by reducing a, a'-di-(m-chloro-pcyclohexylphenyD-a, a-dithio-diacetic acid with zinc amalgam and dilute sulfuric acid, or by reacting the sodium salt of a, m-dichloro-p-cyclohexylphenylacetic acid with excess aqueous-alcoholic sodium hydrosulfide under a nitrogen atmosphere, and separating the mercaptan from the disulfide by fractional crystallization of the diethylammonium salts.

20.0 g. (0.0607 moles) of a, m-dichloro-p-cyclohexyla-methylphenylacctie acid ethyl ester and 5.3 g. (0.0699 moles) of thiourea are dissolved in 30 cc. of dry dimethyllormainide and are heated in an oil bath at 1050 C. for 24 hours. The dimethylformamide is removed under reduced pressure to leave a gum which upon trituration with water precipitates the crude product, which is collected on a filter, washed with water, and dried under vacuum. The crude product is dissolved in methanol, and diluted with ethyl acetate to give 4.4 g. (22.4 of purified product, m.p. 254159 C.

TLC (silica): 5 C 11,: 4 HCOOEt: 1 HCOOH. R; 0.51 Anal. Calculated for C H CIN OS:

59.52% C: 5.93% H; 10.98% Cl; 9.93% S;

8.68% N Found: 59.34% C; 6.30% H; 10.98% Cl; 10.67% S;

EXAMPLE 22 Sodium salt of m-chloro-p-cyclohexyl-a-acetothiophenyl acid S COCH:

O-Q-JIHCOONB The sodium salt of a, m-dichloro-p-cyclohexylphenylacetic acid (0.050 moles) is reacted with purified sodium thial acetate (0.050 moles) in 100 ml. of anhydrous ethanol at 25-80 C. under a nitrogen atomsphere for 4 to 8 hours. The precipitated sodium chloride is filtered off and the filtrate is concentrated to dryness in vacuo at 25 C. to leave the crude product as a residue. The latter is purified by recrystallization or by column chromatography.

EXAMPLE 23 Sodium salt of m-chloro-p-cyclohexyl-a-methylthiophenylacetic acid The procedure is the same as described in Example 22 except that sodium methylmercaptide is used in place of sodium thiolacetate.

EXAMPLE 24 Sodium salt of m-chloro-p-cyclohexyl-a-methysulfonylphenylacetic acid The procedure is the same as described in Example 22 except that sodium methanesulfinate is used in place of sodium thiolacetate.

EXAMPLE 25 Sodium salt of m-chloro-p-cyclohexyl-a-thiocyanophenylacetic acid The procedure is the same as described in Example 22 except that the sodium thiocyanate is used in place of sodium thiolacetate.

EXAMPLE 26 Sodium salt of m-chloro-p-cyclohexyl-a-sulfophen ylacetic acid SO NEI JrrroooNn The procedure is the same as described in Example 22 except that sodium sulfite is used in place of sodium thiolacetate.

EXAMPLE 27 Sodium salt of m-chloro-p-cyclohexyl-a-thiosulfophenylacetic acid SSO Na The procedure is the same as described in Example 22 except that sodium thiosulfate is used in place of sodium thiolacetate.

EXAMPLE 28 Sodium salt of m-chloro-p-cyclohexy-a-ethylxanthylphenylacetic acid @Qhncoom The procedure is the same as described in Example 22 except that sodium ethyl xanthate is used in place olsodium thiolacetate.

EXAMPLE 29 Sodium salt of m-chloro-p-cyclohexyl-a-cyanophenylacetic acid ON @Qlmcoom The procedure is the same as described in Example 22, except that sodium cyanide is used in place of sodium thiolacetate.

EXAMPLE 30 Sodium salt of 01,01-di-(m-chloro-p-cyclohexylphenyl)-a, a'-thiodiacetic acid The procedure is the same as described in Example 22, except that sodium sulfide (0.025 moles) is used in place of sodium thiolacetate (0.050 moles).

EXAMPLE 3l Hydrochloride of m-chloro-p-cyclohexyl-a-isothioureidophenylacetic acid NllzCl S lJNII: QQhneoou m-Chloro-p-cyclohexylphenylglyoxylic acid oxime m-Chloro-p-cyclohexylphenylglyoxylic acid ethyl ester is hydrolyzed by heating with a sodium carbonate solution for 24 hours. The cold reaction mixture is washed with ether, acidified with cold dilute hydrochloric acid, and extracted with ether. Removal of the ether leaves the carboxylic acid compound. 38.5 g. (0.144 moles) of m-chloro-p-cyclohexylphenylglyoxylic acid, 37.0 g. (0.45 moles) of sodium acetate, and 16 g. (0.23 moles) .of hydroxylamine hydrochloride are stirred in 300 of 50% aqueous ethanol at room temperature for 24 hours. The mixture is diluted with water, brought to a pH of 4.0 by the addition of hydrochloric acid, and extracted three times with ether. The combined ether extracts are dried over anhydrous magnesium sulfate, filtered, and concentrated under reduced pressure. On trituration with cyclohexane, 12 g.. (29.5 of the oxime are obtained, M.P. 169.5 C. with decomposition. The oxime gives a red coloration with ferric chloride solution. On concentrating the filtrate and adding heptane, an additional amount of the oxime is obtained, 17.3 g. 42.5 total combined yield: 29.3 g. (72

TLC (silica): 5 C,H,,: 4 HCOOEt: 1 HCOOH, R 0.46 Analysis: Calculated for C I-I CiNO 59.68% C; 5.72% H; 12.59% Cl; 4.97% N Found: 60.10% C; 5.80% H; 11.88% Cl; 4.89% N EXAMPLE 33 a-Amino-m-chloro-p-cyclohexylphenylacetic acid 17.8 g. (0.0633 moles) of m-chloro-p-cyclohexylphenylglyoxylic acid oxime are dissolved in 90 ml. of methanol. Platinum oxide catalyst (0.5 g.) and 12 ml. of 6N hydrochloric acid (0.072 moles) are added, and the mixture is shaken with hydrogen at an initial pressure of55 psi. Total uptake is 98 oftheory in 4 hours. The catalyst is filtered off and the solvent is distilled off under reduced pressure. The residue is triturated with water containing 5.9 g. (0.072 moles) of sodium acetate, filtered, and washed several times with water. The precipitate is stirred with anhydrous ether, filtered, and washed with ether. Yield: 15 g. (89 M.P. 204-205 C, with decomposition.

Analysis: Calculated for C H ,ClNO,. l/2 HCl:

58.79% C; 6.52% H; 18.60% Cl; 4.90% N Found: 59.52% C; 6.55% H; 18.67% Cl; 4.94% N PHARMACEUTICAL COMPOSITIONS CONTAINING THE COMPOUNDS ACCORDING TO THE PRESENT INVENTION The novel substituted phenylacetic acid compounds according to the present invention are preferably administered in therapy in the form of orally administrable solid shaped preparations such as tablets. dragces which may be enterically coated, pills. lozenges. or in powder or granule form, preferably enclosed in geltain and the like capsules. Administration in liquid form. such as in the form of solutions, sirups. emulsions. suspensions, dispersions, fruit juices and the like is also possible.

Such powders, granules, and mixtures to be used in the preparation of tablets and other shaped and/or compressed compositions may be diluted by mixing and milling with a solid pulverulent extending agent to the desired degree of fineness or by impregnating the already milled, finely powdered, solid carrier with a suspension of said compounds in water or with a solution thereof in an organic solvent such as ethanol, methanol, acetone, and others and then removing the water or solvent.

When preparing tablets, pills, dragees, and the like shaped and/or compressed preparations, the commonly used diluting, binding, and disintegrating agents, lubricants, and other tableting adjuvants are employed, provided they are compatible with said substituted phenylacetic acid compounds. Such diluting agents and other excipients are, for instance, sugar, lactose, levulose, starch, bolus alba; as disintegrating and binding agents, gelatin, gum arabic, yeast extract, agar, tragacanth, methyl cellulose, pectin; and as lubricants stearic acid, talc, magnesium stearate, and others.

The compounds according to Formula I may also be administered parenterally, preferably in the form of their water soluble salts, for instance, in sterile isotonic aqueous solution.

Administration in the form of suppositories is, of course, also possible.

Such pharmaceutical compositions are prepared according to pharmaceutical compounding methods as they are conventionally used in the art.

The following examples of pharmaceutical compositions containing the active compounds of Formula 1, their esters and/or their salts, serve to illustrate the preparation thereof without, however, being limited thereto.

Example 34 25 g. ofa,m-dichloro-p-cyclohexylphenylacetic acid ethyl ester and 175 g. of peanut oil Example 35 g. of the diethylammonium salt of a,m-dich|orop-cyclohexylphenylacetic acid, 1200 g. of starch (direct compression grade) as sold by the firm A.E. Staley Mfg. Co. of Decatur, 111. under the trademark STAREX, and 10 g. of magnesium stearate are thoroughly blended and compressed to give tablets, each containing 25 mg. of the active ingredient.

EXAMPLE 36 The mixture of Example 35 is compressed to bicon- PHARMACOLOGICAL TESTS A brief description of the pharmacological tests cnducted with the compounds according to the present invention is given below:

Carrageenan Paw Edema Of the substances used to induce local irritation, carrageenan was selected since most known nonsteroidal anti-inflammatory agents inhibit inflammation caused by said agent.

Ten male rats per dose group (120-150 g.) were given one-half of the test material orally. Thirty minutes later, the remainder of the dose was given and 0.2 ml. of a 1% Carrageenan solution was injected subdermally into the plantar surface of the hind paw. Each paw is marked as a consistent anatomical site, then immersed in a mercury bath to that point. The mercury bath is connected to a pressure transducer and the volume of displacement is read directly on a recorder. Three hours after drug administration, the hind paw volume is measured again. The increased volume is an index of edema. Treated groups are compared to a placebo-treated group to calculate the percent inhibition of edma.

Filter Paper Granuloma This assay was used to evaluate anti-inflammatory agents and to determine the lowest dose which produces significant inhibition of granuloma growth. This assay has the advantage of being semi-acute (4to 7 days). The usual end point involves obtaining the wet weight as well as the dry weight of the granuloma.

Small discs offilter paper saturated with carrageenan were placed subcutaneously in each rat on the first day of the study. Test compound was administered orally on a b.i.d. basis on Day 1 to Day 4. On Day 5, a single dose was given in the morning and the animals were sacrificed in the afternoon. Both filter paper discs were removed and trimmed of extraneous tissue and then weighed. After drying in an oven over the weekened. the dry weight was obtained. Activity was determined by the difference in granuloma weight between a placebo-treated control group and the drug-treated groups.

Randall-Selitto Analgesia Test In accordance with the Randall-Selitto test for measuring the pain threshold, the pressure needed on a metal plunger to give a pain response in a rat when the plunger is placed in the yeast-inflamed hind paw of a rat is measured. Following measurement of control pain threshold, yeast was injected into the paw and the test compound was given orally. The pain threshold was measured at hourly intervals and compared to a placebotreated control group.

Anti-Pyretic Assay Brewers yeast was injected subcutaneously in rats and rectal temperatures were obtained at the end of 5 hours. Those rats (10 per group) having a significant fever were given test compounds and rectal temperatures were measured at hourly intervals for 2 to 3 hours. (A positive response occurs when rectal temperature decreases by 1 C. or more).

Phenylquinone Analgesia Mice were pre-treated orally with test compound and then given 1.25 mg./kg. of phenylquinone i.p. to produce a series of writhes (severe intestinal contractions). The number of writhes was recorded. The percent decrease was calculated from the incidence of writhes in a placebotreated control group.

Ultra-violet Erythema in Guinea Pigs Erythema associated with inflammation was used in the assay. Restricted areas ofa guinea pig were exposed to a controlled ultra-violet light and after 2 hours the exposed areas were graded for the extent of erythema.

Polyarthritis in rats Twelve rats per dose group were treated (b.i.d.) starting the day before injection of adjuvant. Paw volumes were measured for both hind paws on several days during and following drug treatment. Drug was given for a period of 15 days. The paw volume was compared to an untreated control group to determine volume increase. Drug action was calculated as the percent decrease in paw volume (inflammation) as compared to an adjuvant-treated control. Gross signs of inflammation were scored on a weekly basis and drug action calculated as a decrease in total score. Body weights were recorded at intervals.

Acute Toxicity Groups of 10 male mice (18g. to 24 g.) were treated with various doses of drug and were observed for nine days following drug administration. Food and water were delivered ad lib. The drug to be tested was prepared as a water suspension using one drop of Tween per 10 ml. and administered orally as a single dose (10 ml./kg.). The control group received the vehicle only (10 ml./kg.). The lethal dose (LD which is the dose of drug required to kill 50 percent of the animals tested, was determined by the Litchfield and Wilcoxon method.

The following compounds were tested:

Sodium salt of a,m-dichloro-p-cyclohexylphenylacetic acid, designated at 539A;

Diethylammonium salt of m-chloro-p-cyclohexyl-amercaptophenylacetic acid, designated at 528A;

Diethylammonium salt of a,a'-di-(m-chloro-pcyclohexylphenyU-a, a'-dithiodiacetic acid, designated as 531A; 5-(m-Chloro-p-cyclohexylphenyl)-2-imino-4- oxothiazolidine, designated as 530; 5-(m-Chloro-p-cyclohexylphenyl)-2,4-

dioxothiazolidine, designated at 529; a,m-Dichloro-p-cyclohexylphenylacetic acid ethyl ester, designated as 541.

wherein the following legends were employed:

Phenylquinone Writhing 28 7 contents thus are incorporated by reference into the present application.

We claim:

1. A substituted phenylacetic acid compound se- RSA kandall semo Analgesia lected from the group consisting of a substituted CPE Carrageenan Paw Edema phenylacetic acid compound of the formula UVE Ultra-Violet Erythema FPG Filter Paper Granuloma AP Anti-Pyresis X Y P.T. Pain Threshold R ,5 *0 arm Number Positive/Total l0 %1 Percentage increase 3, %l Percentage inhibition R2 Polyarthritis, percent avg.

inhibition at mgJkgJday FPG at 'mgL/kgJduy Acute UVE Nonin- Sec'ondtoxicity Dose, PQW. OPE RSA AP Injected jected ary %l %1 (141350) Compound mgJkg. Route %1 EDsu %l %T PT #P/T #P/T ED50 hinclpaw hindpaw lesions wet dry mgJkg CLINICAL UTILITY The compounds of Formula I, their esters,.and their salts have proved to ,be potent anti-inflammatory drugs with a high analgesic and antipyretic activity. They are administered to patients suffering from rheumatoid arthritis, rheumatoid spondylitis, osteoarthritis, acute gouty arthritis, bursitis, and other arthritic disorders. The esters of said compounds and especially the ethyl ester of a,m-dichlorocyclohexylphenylacetic acid have proved to be especially useful as they are better tolerated and not as irritating on the gastrointestinal tract as the free acids.

As stated hereinabove, the compounds of Formula I, their esters, and their salts are preferably administered in a dose of0.l mg./kg. to mg./kg. given once to four times daily. Thus the actual dose may vary between about 5 mg. and about 500 mg. l to 4 times daily which dose is preferably administered orally.

As stated hereinabove, the starting materials, i.e. the lower alkyl esters of substituted phenylglycolic acids as well as of substituted phenylglyoxylic acids are prepared according to processes described in copending application Ser. No. 767,058 of one of the Applicants of the present application, which application was filed Oct. 10, 1968 under the title p-CYCLOALKYL- PHENYLGLYCOLIC ACID AND DERIVATIVES THEREOF. Said application Ser. No. 767,058 and its wherein p I R, is a member selected from the group consisting of cycloalkyl with Sto 7 carbon atomsand lower alkyl substituted'cycloalkyl;

R is a member selected from the group consisting of halogen, nitro, cyano, trifluoromethyl and lower alkylsulfonyl; I

R is hydrogen;

X is halogen; I

Y is hydroxyl;

the lower alkyl members in said formula being lower alkyl with l to 8 carbon atoms;

and the substantially non-toxic, pharmaceutically acceptable esters and salts of said substituted phenylacetic acid compounds of the above given formula; said esters being selected from the group consisting of those formed from y a lower aliphatic alcohol having 1 to 8 carbon atoms;

an alicyclic alcohol having 6 to 14 carbon atoms;

a terpene having 6 to 14 carbon atoms,

a hydrocarbon aryl alcohol having 6 to 14 carbon atoms,

a hydrocarbon aralkyl alcohol having 7 to l4 carbon atoms, and a heterocyclic alcohol selected from the group consisting of furfuryl alcohol, piperidinoethanol, pyrrolidinoethanol and pipera'zinoethanol; and said salts being selected from the group consisting of an alkali metal salt,

an alkaline earth metal salt,

an ammonium salt,

a di-lower alkyl ammonium salt,

a hydroxy lower alkylammonium salt,

a piperazinium salt,

a piperidinium salt, and

a lower alkyl benzylammonium salt.

2. The substituted phenylacetic acid compound of claim 1, said compound being the lower alkyl ester of said acid.

3. The substituted phencylacetic acid compound of claim 1, said compound being dextrorotary.

4. The substituted phenylacetic acid compound of claim 1, said compound being levorotary.

5. The substituted phenylacetic acid compound of claim 1, said compound being selected from the group consisting of an a,m-dihalo-p-cycloalkylphenylacetic acid and its substantially non-toxic, pharmaceutically acceptable esters and salts.

6. The compound of claim 1, which is the sodium salt of a,m-dichloro-p-cyclohexylphenylacetic acid.

7. The compound of claim 1, which is a,m-dichlorop-cyclohexylphenylacetic acid.

8. The compound of claim 1, which is a,m-dichlorop-cyclohexylphenylacetic acid ethyl ester.

9. The compound of claim 1, which is the diethylammonium salt of a,m-dichloro-p-cyclohexylphenylacetic acid.

10. A substituted phenylacetic acid compound selected from the group consisting of a substituted phenylacetic acid compound of the formula lh --Jl--J,.. .0

I ia

z wherein 30 mula being lower alkyl with l to 8 carbon atoms; and the substantially non-toxic, pharmaceutically acceptable esters and salts of said substituted phenylacetic acid compounds ofthe above given formula; said esters being selected from the group consisting of those formed from a lower aliphatic alcohol having 1 to 8 carbon atoms;

an alicyclic alcohol having 6 to 14 carbon atoms;

a terpene having 6 to 14 carbon atoms,

a hydrocarbon aryl alcohol having 6 to 14 carbon atoms,

a hydrocarbon aralkyl alcohol having 7 to [4 carbon atoms, and a heterocyclic alcohol selected from the group consisting of furfuryl alcohol, piperidinoethanol, pyrrolidinoethanol and piperazinoethanol; and said salts being selected from the group consisting of an alkali metal salt,

an alkaline earth metal salt,

an ammonium salt,

a di-lower alkyl ammonium salt,

a hydroxy lower alkylammonium salt,

a piperazinium salt,

a piperidinium salt, and

a lower alkyl benzylammonium salt.

11. The compound of claim 5 which is a-bromo-mchloro-p-cyc]ohexylphenylacetic acid.

12. The compound of claim 5 which is a-chloro-mbromo-p-cyclohexylphenylacetic acid.

13. The compound of claim 12 which is the diethylammonium salt of a-chloro-m-bromo-p-cyclohexylphenylacetic acid.

14. A substituted phenylacetic acid compound of claim 1, said compound being selected from the group consisting of an a-halo-m-nitro-p-cycloalkylphenylacetic acid and its substantially non-toxic, pharmaceutically acceptable esters and salts.

15. The compound which is a-chloro-m-nitro-pcyclohexylphenylacetic acid.

16. The substituted phenylacetic acid compound selected from the group consisting of a,m-dichloro-pcyclohexylphenylacetic acid, its pharmaceutically acceptable lower alkyl esters, alkali metal salts and dilower alkyl-ammonium salts. 

1. A SUBSTITUTED PHENYLACETIC ACID COMPOUND SELECTED FROM THE GROUP CONSISTING OF A SUBSTITUTED PHENYACETIC ACID COMPOUND OF THE FORMULA
 2. The substituted phenylacetic acid compound of claim 1, said compound being the lower alkyl ester of said acid.
 3. The substituted phencylacetic acid compound of claim 1, said compound being dextrorotary.
 4. The substituted phenylacetic acid compound of claim 1, said compound being levorotary.
 5. The substituted phenylacetic acid compound of claim 1, said compound being selected from the group consisting of an Alpha , m-dihalo-p-cycloalkylphenylacetic acid and its substantially non-toxic, pharmaceutically acceptable esters and salts.
 6. The compound of claim 1, which is the sodium salt of Alpha , m-dichloro-p-cyclohexylphenylacetic acid.
 7. The compound of claim 1, which is Alpha ,m-dichloro-p-cyclohexylphenylacetic acid.
 8. The compound of claim 1, which is Alpha ,m-dichloro-p-cyclohexylphenylacetic acid ethyl ester.
 9. The compound of claim 1, which is the diethylammonium salt of Alpha ,m-dichloro-p-cyclohexylphenyl-acetic acid.
 10. A substituted phenylacetic acid compound selected from the group consisting of a substituted phenylacetic acid compound of the formula
 11. The compound of claim 5 which is Alpha -bromo-m-chloro-p-cyclohexylphenylacetic acid.
 12. The compound of claim 5 which is Alpha -chloro-m-bromo-p-cyclohexylphenylacetic acid.
 13. The compound of claim 12 which is the diethyl-ammonium salt of Alpha -chloro-m-bromo-p-cyclohexylphenylacetic acid.
 14. A substituted phenylacetic acid compound of claim 1, said compound being selected from the group consisting of an Alpha -halo-m-nitro-p-cycloalkylphenylacetic acid and its substantially non-toxic, pharmaceutically acceptable esters and salts.
 15. The compound which is Alpha -chloro-m-nitro-p-cyclohexylphenylacetIc acid.
 16. The substituted phenylacetic acid compound selected from the group consisting of Alpha ,m-dichloro-p-cyclohexylphenylacetic acid, its pharmaceutically acceptable lower alkyl esters, alkali metal salts and di-lower alkyl-ammonium salts. 